---
title: "CVE-2021-3607\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2021-3607?format=md
keywords: index, follow
---

# CVE-2021-3607

Publication date 18 June 2021

Last updated 25 August 2025

---

Ubuntu priority

**Low**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**6.0 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2021-3607?format=md#impact-score)

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## Description

An integer overflow was found in the QEMU implementation of VMWare's
paravirtual RDMA device in versions prior to 6.1.0. The issue occurs while
handling a "PVRDMA\_REG\_DSRHIGH" write from the guest due to improper input
validation. This flaw allows a privileged guest user to make QEMU allocate
a large amount of memory, resulting in a denial of service. The highest
threat from this vulnerability is to system availability.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| qemu | 22.04 LTS jammy | Fixed 1:6.0+dfsg-2expubuntu1 |
| 21.10 impish | Fixed 1:6.0+dfsg-2expubuntu1 |
| 21.04 hirsute | Fixed 1:5.2+dfsg-9ubuntu3.1 |
| 20.10 groovy | Fixed 1:5.0-5ubuntu9.9 |
| 20.04 LTS focal | Fixed 1:4.2-3ubuntu6.17 |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not affected |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2021-3607?format=md#patch-details)

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| qemu | * Upstream:   <https://git.qemu.org/?p=qemu.git;a=commit;h=32e5703cfea07c91e6e84bcb0313f633bb146534> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.0 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Local |
  | Attack complexity | Low |
  | Privileges required | High |
  | User interaction | None |
  | Scope | Changed |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.0 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3607)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2021-3607)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2021-3607)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2021-3607)

### Related Ubuntu Security Notices (USN)

+ [USN-5010-1](https://usn.ubuntu.com/USN-5010-1)
+ QEMU vulnerabilities
+ 15 July 2021

### Other references

* <https://lists.gnu.org/archive/html/qemu-devel/2021-06/msg07925.html>
* <https://www.cve.org/CVERecord?id=CVE-2021-3607>